Well, they went on with no damage/stripped threads etc.
Took me about 30 minutes to undo the bottom bolt on 1 side, had to get a longer bar on the ratchet as it was effing tight
Plus working on the floor meant I could only turn the bolt about a 1/8 of a turn at a time before taking the long bar off, resetting the ratchet and trying again....as the long bar hit the bumper
2nd one swapped out in less than 5 minutes.
God I need a car lift in my life.
Back end feels transformed